// https://github.com/progers/pathseg/blob/v1.0.2/pathseg.js
// SVGPathSeg API polyfill
// https://github.com/progers/pathseg
//
// This is a drop-in replacement for the SVGPathSeg and SVGPathSegList APIs that were removed from
// SVG2 (https://lists.w3.org/Archives/Public/www-svg/2015Jun/0044.html), including the latest spec
// changes which were implemented in Firefox 43 and Chrome 46.

(function() { "use strict";
  if (!("SVGPathSeg" in window)) {
    // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-InterfaceSVGPathSeg
    window.SVGPathSeg = function(type, typeAsLetter, owningPathSegList) {
      this.pathSegType = type;
      this.pathSegTypeAsLetter = typeAsLetter;
      this._owningPathSegList = owningPathSegList;
    }

    SVGPathSeg.prototype.classname = "SVGPathSeg";

    SVGPathSeg.PATHSEG_UNKNOWN = 0;
    SVGPathSeg.PATHSEG_CLOSEPATH = 1;
    SVGPathSeg.PATHSEG_MOVETO_ABS = 2;
    SVGPathSeg.PATHSEG_MOVETO_REL = 3;
    SVGPathSeg.PATHSEG_LINETO_ABS = 4;
    SVGPathSeg.PATHSEG_LINETO_REL = 5;
    SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS = 6;
    SVGPathSeg.PATHSEG_CURVETO_CUBIC_REL = 7;
    SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_ABS = 8;
    SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_REL = 9;
    SVGPathSeg.PATHSEG_ARC_ABS = 10;
    SVGPathSeg.PATHSEG_ARC_REL = 11;
    SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_ABS = 12;
    SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_REL = 13;
    SVGPathSeg.PATHSEG_LINETO_VERTICAL_ABS = 14;
    SVGPathSeg.PATHSEG_LINETO_VERTICAL_REL = 15;
    SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_ABS = 16;
    SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_REL = 17;
    SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS = 18;
    SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL = 19;

    // Notify owning PathSegList on any changes so they can be synchronized back to the path element.
    SVGPathSeg.prototype._segmentChanged = function() {
      if (this._owningPathSegList)
        this._owningPathSegList.segmentChanged(this);
    }

    window.SVGPathSegClosePath = function(owningPathSegList) {
      SVGPathSeg.call(this, SVGPathSeg.PATHSEG_CLOSEPATH, "z", owningPathSegList);
    }
    SVGPathSegClosePath.prototype = Object.create(SVGPathSeg.prototype);
    SVGPathSegClosePath.prototype.toString = function() { return "[object SVGPathSegClosePath]"; }
    SVGPathSegClosePath.prototype._asPathString = function() { return this.pathSegTypeAsLetter; }
    SVGPathSegClosePath.prototype.clone = function() { return new SVGPathSegClosePath(undefined); }

    window.SVGPathSegMovetoAbs = function(owningPathSegList, x, y) {
      SVGPathSeg.call(this, SVGPathSeg.PATHSEG_MOVETO_ABS, "M", owningPathSegList);
      this._x = x;
      this._y = y;
    }
    SVGPathSegMovetoAbs.prototype = Object.create(SVGPathSeg.prototype);
    SVGPathSegMovetoAbs.prototype.toString = function() { return "[object SVGPathSegMovetoAbs]"; }
    SVGPathSegMovetoAbs.prototype._asPathString = function() { return this.pathSegTypeAsLetter + " " + this._x + " " + this._y; }
    SVGPathSegMovetoAbs.prototype.clone = function() { return new SVGPathSegMovetoAbs(undefined, this._x, this._y); }
    Object.defineProperty(SVGPathSegMovetoAbs.prototype, "x", { get: function() { return this._x; }, set: function(x) { this._x = x; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegMovetoAbs.prototype, "y", { get: function() { return this._y; }, set: function(y) { this._y = y; this._segmentChanged(); }, enumerable: true });

    window.SVGPathSegMovetoRel = function(owningPathSegList, x, y) {
      SVGPathSeg.call(this, SVGPathSeg.PATHSEG_MOVETO_REL, "m", owningPathSegList);
      this._x = x;
      this._y = y;
    }
    SVGPathSegMovetoRel.prototype = Object.create(SVGPathSeg.prototype);
    SVGPathSegMovetoRel.prototype.toString = function() { return "[object SVGPathSegMovetoRel]"; }
    SVGPathSegMovetoRel.prototype._asPathString = function() { return this.pathSegTypeAsLetter + " " + this._x + " " + this._y; }
    SVGPathSegMovetoRel.prototype.clone = function() { return new SVGPathSegMovetoRel(undefined, this._x, this._y); }
    Object.defineProperty(SVGPathSegMovetoRel.prototype, "x", { get: function() { return this._x; }, set: function(x) { this._x = x; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegMovetoRel.prototype, "y", { get: function() { return this._y; }, set: function(y) { this._y = y; this._segmentChanged(); }, enumerable: true });

    window.SVGPathSegLinetoAbs = function(owningPathSegList, x, y) {
      SVGPathSeg.call(this, SVGPathSeg.PATHSEG_LINETO_ABS, "L", owningPathSegList);
      this._x = x;
      this._y = y;
    }
    SVGPathSegLinetoAbs.prototype = Object.create(SVGPathSeg.prototype);
    SVGPathSegLinetoAbs.prototype.toString = function() { return "[object SVGPathSegLinetoAbs]"; }
    SVGPathSegLinetoAbs.prototype._asPathString = function() { return this.pathSegTypeAsLetter + " " + this._x + " " + this._y; }
    SVGPathSegLinetoAbs.prototype.clone = function() { return new SVGPathSegLinetoAbs(undefined, this._x, this._y); }
    Object.defineProperty(SVGPathSegLinetoAbs.prototype, "x", { get: function() { return this._x; }, set: function(x) { this._x = x; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegLinetoAbs.prototype, "y", { get: function() { return this._y; }, set: function(y) { this._y = y; this._segmentChanged(); }, enumerable: true });

    window.SVGPathSegLinetoRel = function(owningPathSegList, x, y) {
      SVGPathSeg.call(this, SVGPathSeg.PATHSEG_LINETO_REL, "l", owningPathSegList);
      this._x = x;
      this._y = y;
    }
    SVGPathSegLinetoRel.prototype = Object.create(SVGPathSeg.prototype);
    SVGPathSegLinetoRel.prototype.toString = function() { return "[object SVGPathSegLinetoRel]"; }
    SVGPathSegLinetoRel.prototype._asPathString = function() { return this.pathSegTypeAsLetter + " " + this._x + " " + this._y; }
    SVGPathSegLinetoRel.prototype.clone = function() { return new SVGPathSegLinetoRel(undefined, this._x, this._y); }
    Object.defineProperty(SVGPathSegLinetoRel.prototype, "x", { get: function() { return this._x; }, set: function(x) { this._x = x; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegLinetoRel.prototype, "y", { get: function() { return this._y; }, set: function(y) { this._y = y; this._segmentChanged(); }, enumerable: true });

    window.SVGPathSegCurvetoCubicAbs = function(owningPathSegList, x, y, x1, y1, x2, y2) {
      SVGPathSeg.call(this, SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS, "C", owningPathSegList);
      this._x = x;
      this._y = y;
      this._x1 = x1;
      this._y1 = y1;
      this._x2 = x2;
      this._y2 = y2;
    }
    SVGPathSegCurvetoCubicAbs.prototype = Object.create(SVGPathSeg.prototype);
    SVGPathSegCurvetoCubicAbs.prototype.toString = function() { return "[object SVGPathSegCurvetoCubicAbs]"; }
    SVGPathSegCurvetoCubicAbs.prototype._asPathString = function() { return this.pathSegTypeAsLetter + " " + this._x1 + " " + this._y1 + " " + this._x2 + " " + this._y2 + " " + this._x + " " + this._y; }
    SVGPathSegCurvetoCubicAbs.prototype.clone = function() { return new SVGPathSegCurvetoCubicAbs(undefined, this._x, this._y, this._x1, this._y1, this._x2, this._y2); }
    Object.defineProperty(SVGPathSegCurvetoCubicAbs.prototype, "x", { get: function() { return this._x; }, set: function(x) { this._x = x; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegCurvetoCubicAbs.prototype, "y", { get: function() { return this._y; }, set: function(y) { this._y = y; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegCurvetoCubicAbs.prototype, "x1", { get: function() { return this._x1; }, set: function(x1) { this._x1 = x1; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegCurvetoCubicAbs.prototype, "y1", { get: function() { return this._y1; }, set: function(y1) { this._y1 = y1; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegCurvetoCubicAbs.prototype, "x2", { get: function() { return this._x2; }, set: function(x2) { this._x2 = x2; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegCurvetoCubicAbs.prototype, "y2", { get: function() { return this._y2; }, set: function(y2) { this._y2 = y2; this._segmentChanged(); }, enumerable: true });

    window.SVGPathSegCurvetoCubicRel = function(owningPathSegList, x, y, x1, y1, x2, y2) {
      SVGPathSeg.call(this, SVGPathSeg.PATHSEG_CURVETO_CUBIC_REL, "c", owningPathSegList);
      this._x = x;
      this._y = y;
      this._x1 = x1;
      this._y1 = y1;
      this._x2 = x2;
      this._y2 = y2;
    }
    SVGPathSegCurvetoCubicRel.prototype = Object.create(SVGPathSeg.prototype);
    SVGPathSegCurvetoCubicRel.prototype.toString = function() { return "[object SVGPathSegCurvetoCubicRel]"; }
    SVGPathSegCurvetoCubicRel.prototype._asPathString = function() { return this.pathSegTypeAsLetter + " " + this._x1 + " " + this._y1 + " " + this._x2 + " " + this._y2 + " " + this._x + " " + this._y; }
    SVGPathSegCurvetoCubicRel.prototype.clone = function() { return new SVGPathSegCurvetoCubicRel(undefined, this._x, this._y, this._x1, this._y1, this._x2, this._y2); }
    Object.defineProperty(SVGPathSegCurvetoCubicRel.prototype, "x", { get: function() { return this._x; }, set: function(x) { this._x = x; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegCurvetoCubicRel.prototype, "y", { get: function() { return this._y; }, set: function(y) { this._y = y; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegCurvetoCubicRel.prototype, "x1", { get: function() { return this._x1; }, set: function(x1) { this._x1 = x1; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegCurvetoCubicRel.prototype, "y1", { get: function() { return this._y1; }, set: function(y1) { this._y1 = y1; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegCurvetoCubicRel.prototype, "x2", { get: function() { return this._x2; }, set: function(x2) { this._x2 = x2; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegCurvetoCubicRel.prototype, "y2", { get: function() { return this._y2; }, set: function(y2) { this._y2 = y2; this._segmentChanged(); }, enumerable: true });

    window.SVGPathSegCurvetoQuadraticAbs = function(owningPathSegList, x, y, x1, y1) {
      SVGPathSeg.call(this, SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_ABS, "Q", owningPathSegList);
      this._x = x;
      this._y = y;
      this._x1 = x1;
      this._y1 = y1;
    }
    SVGPathSegCurvetoQuadraticAbs.prototype = Object.create(SVGPathSeg.prototype);
    SVGPathSegCurvetoQuadraticAbs.prototype.toString = function() { return "[object SVGPathSegCurvetoQuadraticAbs]"; }
    SVGPathSegCurvetoQuadraticAbs.prototype._asPathString = function() { return this.pathSegTypeAsLetter + " " + this._x1 + " " + this._y1 + " " + this._x + " " + this._y; }
    SVGPathSegCurvetoQuadraticAbs.prototype.clone = function() { return new SVGPathSegCurvetoQuadraticAbs(undefined, this._x, this._y, this._x1, this._y1); }
    Object.defineProperty(SVGPathSegCurvetoQuadraticAbs.prototype, "x", { get: function() { return this._x; }, set: function(x) { this._x = x; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegCurvetoQuadraticAbs.prototype, "y", { get: function() { return this._y; }, set: function(y) { this._y = y; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegCurvetoQuadraticAbs.prototype, "x1", { get: function() { return this._x1; }, set: function(x1) { this._x1 = x1; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegCurvetoQuadraticAbs.prototype, "y1", { get: function() { return this._y1; }, set: function(y1) { this._y1 = y1; this._segmentChanged(); }, enumerable: true });

    window.SVGPathSegCurvetoQuadraticRel = function(owningPathSegList, x, y, x1, y1) {
      SVGPathSeg.call(this, SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_REL, "q", owningPathSegList);
      this._x = x;
      this._y = y;
      this._x1 = x1;
      this._y1 = y1;
    }
    SVGPathSegCurvetoQuadraticRel.prototype = Object.create(SVGPathSeg.prototype);
    SVGPathSegCurvetoQuadraticRel.prototype.toString = function() { return "[object SVGPathSegCurvetoQuadraticRel]"; }
    SVGPathSegCurvetoQuadraticRel.prototype._asPathString = function() { return this.pathSegTypeAsLetter + " " + this._x1 + " " + this._y1 + " " + this._x + " " + this._y; }
    SVGPathSegCurvetoQuadraticRel.prototype.clone = function() { return new SVGPathSegCurvetoQuadraticRel(undefined, this._x, this._y, this._x1, this._y1); }
    Object.defineProperty(SVGPathSegCurvetoQuadraticRel.prototype, "x", { get: function() { return this._x; }, set: function(x) { this._x = x; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegCurvetoQuadraticRel.prototype, "y", { get: function() { return this._y; }, set: function(y) { this._y = y; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegCurvetoQuadraticRel.prototype, "x1", { get: function() { return this._x1; }, set: function(x1) { this._x1 = x1; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegCurvetoQuadraticRel.prototype, "y1", { get: function() { return this._y1; }, set: function(y1) { this._y1 = y1; this._segmentChanged(); }, enumerable: true });

    window.SVGPathSegArcAbs = function(owningPathSegList, x, y, r1, r2, angle, largeArcFlag, sweepFlag) {
      SVGPathSeg.call(this, SVGPathSeg.PATHSEG_ARC_ABS, "A", owningPathSegList);
      this._x = x;
      this._y = y;
      this._r1 = r1;
      this._r2 = r2;
      this._angle = angle;
      this._largeArcFlag = largeArcFlag;
      this._sweepFlag = sweepFlag;
    }
    SVGPathSegArcAbs.prototype = Object.create(SVGPathSeg.prototype);
    SVGPathSegArcAbs.prototype.toString = function() { return "[object SVGPathSegArcAbs]"; }
    SVGPathSegArcAbs.prototype._asPathString = function() { return this.pathSegTypeAsLetter + " " + this._r1 + " " + this._r2 + " " + this._angle + " " + (this._largeArcFlag ? "1" : "0") + " " + (this._sweepFlag ? "1" : "0") + " " + this._x + " " + this._y; }
    SVGPathSegArcAbs.prototype.clone = function() { return new SVGPathSegArcAbs(undefined, this._x, this._y, this._r1, this._r2, this._angle, this._largeArcFlag, this._sweepFlag); }
    Object.defineProperty(SVGPathSegArcAbs.prototype, "x", { get: function() { return this._x; }, set: function(x) { this._x = x; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegArcAbs.prototype, "y", { get: function() { return this._y; }, set: function(y) { this._y = y; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegArcAbs.prototype, "r1", { get: function() { return this._r1; }, set: function(r1) { this._r1 = r1; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegArcAbs.prototype, "r2", { get: function() { return this._r2; }, set: function(r2) { this._r2 = r2; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegArcAbs.prototype, "angle", { get: function() { return this._angle; }, set: function(angle) { this._angle = angle; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegArcAbs.prototype, "largeArcFlag", { get: function() { return this._largeArcFlag; }, set: function(largeArcFlag) { this._largeArcFlag = largeArcFlag; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegArcAbs.prototype, "sweepFlag", { get: function() { return this._sweepFlag; }, set: function(sweepFlag) { this._sweepFlag = sweepFlag; this._segmentChanged(); }, enumerable: true });

    window.SVGPathSegArcRel = function(owningPathSegList, x, y, r1, r2, angle, largeArcFlag, sweepFlag) {
      SVGPathSeg.call(this, SVGPathSeg.PATHSEG_ARC_REL, "a", owningPathSegList);
      this._x = x;
      this._y = y;
      this._r1 = r1;
      this._r2 = r2;
      this._angle = angle;
      this._largeArcFlag = largeArcFlag;
      this._sweepFlag = sweepFlag;
    }
    SVGPathSegArcRel.prototype = Object.create(SVGPathSeg.prototype);
    SVGPathSegArcRel.prototype.toString = function() { return "[object SVGPathSegArcRel]"; }
    SVGPathSegArcRel.prototype._asPathString = function() { return this.pathSegTypeAsLetter + " " + this._r1 + " " + this._r2 + " " + this._angle + " " + (this._largeArcFlag ? "1" : "0") + " " + (this._sweepFlag ? "1" : "0") + " " + this._x + " " + this._y; }
    SVGPathSegArcRel.prototype.clone = function() { return new SVGPathSegArcRel(undefined, this._x, this._y, this._r1, this._r2, this._angle, this._largeArcFlag, this._sweepFlag); }
    Object.defineProperty(SVGPathSegArcRel.prototype, "x", { get: function() { return this._x; }, set: function(x) { this._x = x; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegArcRel.prototype, "y", { get: function() { return this._y; }, set: function(y) { this._y = y; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegArcRel.prototype, "r1", { get: function() { return this._r1; }, set: function(r1) { this._r1 = r1; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegArcRel.prototype, "r2", { get: function() { return this._r2; }, set: function(r2) { this._r2 = r2; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegArcRel.prototype, "angle", { get: function() { return this._angle; }, set: function(angle) { this._angle = angle; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegArcRel.prototype, "largeArcFlag", { get: function() { return this._largeArcFlag; }, set: function(largeArcFlag) { this._largeArcFlag = largeArcFlag; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegArcRel.prototype, "sweepFlag", { get: function() { return this._sweepFlag; }, set: function(sweepFlag) { this._sweepFlag = sweepFlag; this._segmentChanged(); }, enumerable: true });

    window.SVGPathSegLinetoHorizontalAbs = function(owningPathSegList, x) {
      SVGPathSeg.call(this, SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_ABS, "H", owningPathSegList);
      this._x = x;
    }
    SVGPathSegLinetoHorizontalAbs.prototype = Object.create(SVGPathSeg.prototype);
    SVGPathSegLinetoHorizontalAbs.prototype.toString = function() { return "[object SVGPathSegLinetoHorizontalAbs]"; }
    SVGPathSegLinetoHorizontalAbs.prototype._asPathString = function() { return this.pathSegTypeAsLetter + " " + this._x; }
    SVGPathSegLinetoHorizontalAbs.prototype.clone = function() { return new SVGPathSegLinetoHorizontalAbs(undefined, this._x); }
    Object.defineProperty(SVGPathSegLinetoHorizontalAbs.prototype, "x", { get: function() { return this._x; }, set: function(x) { this._x = x; this._segmentChanged(); }, enumerable: true });

    window.SVGPathSegLinetoHorizontalRel = function(owningPathSegList, x) {
      SVGPathSeg.call(this, SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_REL, "h", owningPathSegList);
      this._x = x;
    }
    SVGPathSegLinetoHorizontalRel.prototype = Object.create(SVGPathSeg.prototype);
    SVGPathSegLinetoHorizontalRel.prototype.toString = function() { return "[object SVGPathSegLinetoHorizontalRel]"; }
    SVGPathSegLinetoHorizontalRel.prototype._asPathString = function() { return this.pathSegTypeAsLetter + " " + this._x; }
    SVGPathSegLinetoHorizontalRel.prototype.clone = function() { return new SVGPathSegLinetoHorizontalRel(undefined, this._x); }
    Object.defineProperty(SVGPathSegLinetoHorizontalRel.prototype, "x", { get: function() { return this._x; }, set: function(x) { this._x = x; this._segmentChanged(); }, enumerable: true });

    window.SVGPathSegLinetoVerticalAbs = function(owningPathSegList, y) {
      SVGPathSeg.call(this, SVGPathSeg.PATHSEG_LINETO_VERTICAL_ABS, "V", owningPathSegList);
      this._y = y;
    }
    SVGPathSegLinetoVerticalAbs.prototype = Object.create(SVGPathSeg.prototype);
    SVGPathSegLinetoVerticalAbs.prototype.toString = function() { return "[object SVGPathSegLinetoVerticalAbs]"; }
    SVGPathSegLinetoVerticalAbs.prototype._asPathString = function() { return this.pathSegTypeAsLetter + " " + this._y; }
    SVGPathSegLinetoVerticalAbs.prototype.clone = function() { return new SVGPathSegLinetoVerticalAbs(undefined, this._y); }
    Object.defineProperty(SVGPathSegLinetoVerticalAbs.prototype, "y", { get: function() { return this._y; }, set: function(y) { this._y = y; this._segmentChanged(); }, enumerable: true });

    window.SVGPathSegLinetoVerticalRel = function(owningPathSegList, y) {
      SVGPathSeg.call(this, SVGPathSeg.PATHSEG_LINETO_VERTICAL_REL, "v", owningPathSegList);
      this._y = y;
    }
    SVGPathSegLinetoVerticalRel.prototype = Object.create(SVGPathSeg.prototype);
    SVGPathSegLinetoVerticalRel.prototype.toString = function() { return "[object SVGPathSegLinetoVerticalRel]"; }
    SVGPathSegLinetoVerticalRel.prototype._asPathString = function() { return this.pathSegTypeAsLetter + " " + this._y; }
    SVGPathSegLinetoVerticalRel.prototype.clone = function() { return new SVGPathSegLinetoVerticalRel(undefined, this._y); }
    Object.defineProperty(SVGPathSegLinetoVerticalRel.prototype, "y", { get: function() { return this._y; }, set: function(y) { this._y = y; this._segmentChanged(); }, enumerable: true });

    window.SVGPathSegCurvetoCubicSmoothAbs = function(owningPathSegList, x, y, x2, y2) {
      SVGPathSeg.call(this, SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_ABS, "S", owningPathSegList);
      this._x = x;
      this._y = y;
      this._x2 = x2;
      this._y2 = y2;
    }
    SVGPathSegCurvetoCubicSmoothAbs.prototype = Object.create(SVGPathSeg.prototype);
    SVGPathSegCurvetoCubicSmoothAbs.prototype.toString = function() { return "[object SVGPathSegCurvetoCubicSmoothAbs]"; }
    SVGPathSegCurvetoCubicSmoothAbs.prototype._asPathString = function() { return this.pathSegTypeAsLetter + " " + this._x2 + " " + this._y2 + " " + this._x + " " + this._y; }
    SVGPathSegCurvetoCubicSmoothAbs.prototype.clone = function() { return new SVGPathSegCurvetoCubicSmoothAbs(undefined, this._x, this._y, this._x2, this._y2); }
    Object.defineProperty(SVGPathSegCurvetoCubicSmoothAbs.prototype, "x", { get: function() { return this._x; }, set: function(x) { this._x = x; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegCurvetoCubicSmoothAbs.prototype, "y", { get: function() { return this._y; }, set: function(y) { this._y = y; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegCurvetoCubicSmoothAbs.prototype, "x2", { get: function() { return this._x2; }, set: function(x2) { this._x2 = x2; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegCurvetoCubicSmoothAbs.prototype, "y2", { get: function() { return this._y2; }, set: function(y2) { this._y2 = y2; this._segmentChanged(); }, enumerable: true });

    window.SVGPathSegCurvetoCubicSmoothRel = function(owningPathSegList, x, y, x2, y2) {
      SVGPathSeg.call(this, SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_REL, "s", owningPathSegList);
      this._x = x;
      this._y = y;
      this._x2 = x2;
      this._y2 = y2;
    }
    SVGPathSegCurvetoCubicSmoothRel.prototype = Object.create(SVGPathSeg.prototype);
    SVGPathSegCurvetoCubicSmoothRel.prototype.toString = function() { return "[object SVGPathSegCurvetoCubicSmoothRel]"; }
    SVGPathSegCurvetoCubicSmoothRel.prototype._asPathString = function() { return this.pathSegTypeAsLetter + " " + this._x2 + " " + this._y2 + " " + this._x + " " + this._y; }
    SVGPathSegCurvetoCubicSmoothRel.prototype.clone = function() { return new SVGPathSegCurvetoCubicSmoothRel(undefined, this._x, this._y, this._x2, this._y2); }
    Object.defineProperty(SVGPathSegCurvetoCubicSmoothRel.prototype, "x", { get: function() { return this._x; }, set: function(x) { this._x = x; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegCurvetoCubicSmoothRel.prototype, "y", { get: function() { return this._y; }, set: function(y) { this._y = y; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegCurvetoCubicSmoothRel.prototype, "x2", { get: function() { return this._x2; }, set: function(x2) { this._x2 = x2; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegCurvetoCubicSmoothRel.prototype, "y2", { get: function() { return this._y2; }, set: function(y2) { this._y2 = y2; this._segmentChanged(); }, enumerable: true });

    window.SVGPathSegCurvetoQuadraticSmoothAbs = function(owningPathSegList, x, y) {
      SVGPathSeg.call(this, SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS, "T", owningPathSegList);
      this._x = x;
      this._y = y;
    }
    SVGPathSegCurvetoQuadraticSmoothAbs.prototype = Object.create(SVGPathSeg.prototype);
    SVGPathSegCurvetoQuadraticSmoothAbs.prototype.toString = function() { return "[object SVGPathSegCurvetoQuadraticSmoothAbs]"; }
    SVGPathSegCurvetoQuadraticSmoothAbs.prototype._asPathString = function() { return this.pathSegTypeAsLetter + " " + this._x + " " + this._y; }
    SVGPathSegCurvetoQuadraticSmoothAbs.prototype.clone = function() { return new SVGPathSegCurvetoQuadraticSmoothAbs(undefined, this._x, this._y); }
    Object.defineProperty(SVGPathSegCurvetoQuadraticSmoothAbs.prototype, "x", { get: function() { return this._x; }, set: function(x) { this._x = x; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegCurvetoQuadraticSmoothAbs.prototype, "y", { get: function() { return this._y; }, set: function(y) { this._y = y; this._segmentChanged(); }, enumerable: true });

    window.SVGPathSegCurvetoQuadraticSmoothRel = function(owningPathSegList, x, y) {
      SVGPathSeg.call(this, SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL, "t", owningPathSegList);
      this._x = x;
      this._y = y;
    }
    SVGPathSegCurvetoQuadraticSmoothRel.prototype = Object.create(SVGPathSeg.prototype);
    SVGPathSegCurvetoQuadraticSmoothRel.prototype.toString = function() { return "[object SVGPathSegCurvetoQuadraticSmoothRel]"; }
    SVGPathSegCurvetoQuadraticSmoothRel.prototype._asPathString = function() { return this.pathSegTypeAsLetter + " " + this._x + " " + this._y; }
    SVGPathSegCurvetoQuadraticSmoothRel.prototype.clone = function() { return new SVGPathSegCurvetoQuadraticSmoothRel(undefined, this._x, this._y); }
    Object.defineProperty(SVGPathSegCurvetoQuadraticSmoothRel.prototype, "x", { get: function() { return this._x; }, set: function(x) { this._x = x; this._segmentChanged(); }, enumerable: true });
    Object.defineProperty(SVGPathSegCurvetoQuadraticSmoothRel.prototype, "y", { get: function() { return this._y; }, set: function(y) { this._y = y; this._segmentChanged(); }, enumerable: true });

    // Add createSVGPathSeg* functions to SVGPathElement.
    // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-InterfaceSVGPathElement.
    SVGPathElement.prototype.createSVGPathSegClosePath = function() { return new SVGPathSegClosePath(undefined); }
    SVGPathElement.prototype.createSVGPathSegMovetoAbs = function(x, y) { return new SVGPathSegMovetoAbs(undefined, x, y); }
    SVGPathElement.prototype.createSVGPathSegMovetoRel = function(x, y) { return new SVGPathSegMovetoRel(undefined, x, y); }
    SVGPathElement.prototype.createSVGPathSegLinetoAbs = function(x, y) { return new SVGPathSegLinetoAbs(undefined, x, y); }
    SVGPathElement.prototype.createSVGPathSegLinetoRel = function(x, y) { return new SVGPathSegLinetoRel(undefined, x, y); }
    SVGPathElement.prototype.createSVGPathSegCurvetoCubicAbs = function(x, y, x1, y1, x2, y2) { return new SVGPathSegCurvetoCubicAbs(undefined, x, y, x1, y1, x2, y2); }
    SVGPathElement.prototype.createSVGPathSegCurvetoCubicRel = function(x, y, x1, y1, x2, y2) { return new SVGPathSegCurvetoCubicRel(undefined, x, y, x1, y1, x2, y2); }
    SVGPathElement.prototype.createSVGPathSegCurvetoQuadraticAbs = function(x, y, x1, y1) { return new SVGPathSegCurvetoQuadraticAbs(undefined, x, y, x1, y1); }
    SVGPathElement.prototype.createSVGPathSegCurvetoQuadraticRel = function(x, y, x1, y1) { return new SVGPathSegCurvetoQuadraticRel(undefined, x, y, x1, y1); }
    SVGPathElement.prototype.createSVGPathSegArcAbs = function(x, y, r1, r2, angle, largeArcFlag, sweepFlag) { return new SVGPathSegArcAbs(undefined, x, y, r1, r2, angle, largeArcFlag, sweepFlag); }
    SVGPathElement.prototype.createSVGPathSegArcRel = function(x, y, r1, r2, angle, largeArcFlag, sweepFlag) { return new SVGPathSegArcRel(undefined, x, y, r1, r2, angle, largeArcFlag, sweepFlag); }
    SVGPathElement.prototype.createSVGPathSegLinetoHorizontalAbs = function(x) { return new SVGPathSegLinetoHorizontalAbs(undefined, x); }
    SVGPathElement.prototype.createSVGPathSegLinetoHorizontalRel = function(x) { return new SVGPathSegLinetoHorizontalRel(undefined, x); }
    SVGPathElement.prototype.createSVGPathSegLinetoVerticalAbs = function(y) { return new SVGPathSegLinetoVerticalAbs(undefined, y); }
    SVGPathElement.prototype.createSVGPathSegLinetoVerticalRel = function(y) { return new SVGPathSegLinetoVerticalRel(undefined, y); }
    SVGPathElement.prototype.createSVGPathSegCurvetoCubicSmoothAbs = function(x, y, x2, y2) { return new SVGPathSegCurvetoCubicSmoothAbs(undefined, x, y, x2, y2); }
    SVGPathElement.prototype.createSVGPathSegCurvetoCubicSmoothRel = function(x, y, x2, y2) { return new SVGPathSegCurvetoCubicSmoothRel(undefined, x, y, x2, y2); }
    SVGPathElement.prototype.createSVGPathSegCurvetoQuadraticSmoothAbs = function(x, y) { return new SVGPathSegCurvetoQuadraticSmoothAbs(undefined, x, y); }
    SVGPathElement.prototype.createSVGPathSegCurvetoQuadraticSmoothRel = function(x, y) { return new SVGPathSegCurvetoQuadraticSmoothRel(undefined, x, y); }
  }

  if (!("SVGPathSegList" in window)) {
    // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-InterfaceSVGPathSegList
    window.SVGPathSegList = function(pathElement) {
      this._pathElement = pathElement;
      this._list = this._parsePath(this._pathElement.getAttribute("d"));

      // Use a MutationObserver to catch changes to the path's "d" attribute.
      this._mutationObserverConfig = { "attributes": true, "attributeFilter": ["d"] };
      this._pathElementMutationObserver = new MutationObserver(this._updateListFromPathMutations.bind(this));
      this._pathElementMutationObserver.observe(this._pathElement, this._mutationObserverConfig);
    }

    SVGPathSegList.prototype.classname = "SVGPathSegList";

    Object.defineProperty(SVGPathSegList.prototype, "numberOfItems", {
      get: function() {
        this._checkPathSynchronizedToList();
        return this._list.length;
      },
      enumerable: true
    });

    // Add the pathSegList accessors to SVGPathElement.
    // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-InterfaceSVGAnimatedPathData
    Object.defineProperty(SVGPathElement.prototype, "pathSegList", {
      get: function() {
        if (!this._pathSegList)
          this._pathSegList = new SVGPathSegList(this);
        return this._pathSegList;
      },
      enumerable: true
    });
    // FIXME: The following are not implemented and simply return SVGPathElement.pathSegList.
    Object.defineProperty(SVGPathElement.prototype, "normalizedPathSegList", { get: function() { return this.pathSegList; }, enumerable: true });
    Object.defineProperty(SVGPathElement.prototype, "animatedPathSegList", { get: function() { return this.pathSegList; }, enumerable: true });
    Object.defineProperty(SVGPathElement.prototype, "animatedNormalizedPathSegList", { get: function() { return this.pathSegList; }, enumerable: true });

    // Process any pending mutations to the path element and update the list as needed.
    // This should be the first call of all public functions and is needed because
    // MutationObservers are not synchronous so we can have pending asynchronous mutations.
    SVGPathSegList.prototype._checkPathSynchronizedToList = function() {
      this._updateListFromPathMutations(this._pathElementMutationObserver.takeRecords());
    }

    SVGPathSegList.prototype._updateListFromPathMutations = function(mutationRecords) {
      if (!this._pathElement)
        return;
      var hasPathMutations = false;
      mutationRecords.forEach(function(record) {
        if (record.attributeName == "d")
          hasPathMutations = true;
      });
      if (hasPathMutations)
        this._list = this._parsePath(this._pathElement.getAttribute("d"));
    }

    // Serialize the list and update the path's 'd' attribute.
    SVGPathSegList.prototype._writeListToPath = function() {
      this._pathElementMutationObserver.disconnect();
      this._pathElement.setAttribute("d", SVGPathSegList._pathSegArrayAsString(this._list));
      this._pathElementMutationObserver.observe(this._pathElement, this._mutationObserverConfig);
    }

    // When a path segment changes the list needs to be synchronized back to the path element.
    SVGPathSegList.prototype.segmentChanged = function(pathSeg) {
      this._writeListToPath();
    }

    SVGPathSegList.prototype.clear = function() {
      this._checkPathSynchronizedToList();

      this._list.forEach(function(pathSeg) {
        pathSeg._owningPathSegList = null;
      });
      this._list = [];
      this._writeListToPath();
    }

    SVGPathSegList.prototype.initialize = function(newItem) {
      this._checkPathSynchronizedToList();

      this._list = [newItem];
      newItem._owningPathSegList = this;
      this._writeListToPath();
      return newItem;
    }

    SVGPathSegList.prototype._checkValidIndex = function(index) {
      if (isNaN(index) || index < 0 || index >= this.numberOfItems)
        throw "INDEX_SIZE_ERR";
    }

    SVGPathSegList.prototype.getItem = function(index) {
      this._checkPathSynchronizedToList();

      this._checkValidIndex(index);
      return this._list[index];
    }

    SVGPathSegList.prototype.insertItemBefore = function(newItem, index) {
      this._checkPathSynchronizedToList();

      // Spec: If the index is greater than or equal to numberOfItems, then the new item is appended to the end of the list.
      if (index > this.numberOfItems)
        index = this.numberOfItems;
      if (newItem._owningPathSegList) {
        // SVG2 spec says to make a copy.
        newItem = newItem.clone();
      }
      this._list.splice(index, 0, newItem);
      newItem._owningPathSegList = this;
      this._writeListToPath();
      return newItem;
    }

    SVGPathSegList.prototype.replaceItem = function(newItem, index) {
      this._checkPathSynchronizedToList();

      if (newItem._owningPathSegList) {
        // SVG2 spec says to make a copy.
        newItem = newItem.clone();
      }
      this._checkValidIndex(index);
      this._list[index] = newItem;
      newItem._owningPathSegList = this;
      this._writeListToPath();
      return newItem;
    }

    SVGPathSegList.prototype.removeItem = function(index) {
      this._checkPathSynchronizedToList();

      this._checkValidIndex(index);
      var item = this._list[index];
      this._list.splice(index, 1);
      this._writeListToPath();
      return item;
    }

    SVGPathSegList.prototype.appendItem = function(newItem) {
      this._checkPathSynchronizedToList();

      if (newItem._owningPathSegList) {
        // SVG2 spec says to make a copy.
        newItem = newItem.clone();
      }
      this._list.push(newItem);
      newItem._owningPathSegList = this;
      // TODO: Optimize this to just append to the existing attribute.
      this._writeListToPath();
      return newItem;
    }

    SVGPathSegList._pathSegArrayAsString = function(pathSegArray) {
      var string = "";
      var first = true;
      pathSegArray.forEach(function(pathSeg) {
        if (first) {
          first = false;
          string += pathSeg._asPathString();
        } else {
          string += " " + pathSeg._asPathString();
        }
      });
      return string;
    }

    // This closely follows SVGPathParser::parsePath from Source/core/svg/SVGPathParser.cpp.
    SVGPathSegList.prototype._parsePath = function(string) {
      if (!string || string.length == 0)
        return [];

      var owningPathSegList = this;

      var Builder = function() {
        this.pathSegList = [];
      }

      Builder.prototype.appendSegment = function(pathSeg) {
        this.pathSegList.push(pathSeg);
      }

      var Source = function(string) {
        this._string = string;
        this._currentIndex = 0;
        this._endIndex = this._string.length;
        this._previousCommand = SVGPathSeg.PATHSEG_UNKNOWN;

        this._skipOptionalSpaces();
      }

      Source.prototype._isCurrentSpace = function() {
        var character = this._string[this._currentIndex];
        return character <= " " && (character == " " || character == "\n" || character == "\t" || character == "\r" || character == "\f");
      }

      Source.prototype._skipOptionalSpaces = function() {
        while (this._currentIndex < this._endIndex && this._isCurrentSpace())
          this._currentIndex++;
        return this._currentIndex < this._endIndex;
      }

      Source.prototype._skipOptionalSpacesOrDelimiter = function() {
        if (this._currentIndex < this._endIndex && !this._isCurrentSpace() && this._string.charAt(this._currentIndex) != ",")
          return false;
        if (this._skipOptionalSpaces()) {
          if (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) == ",") {
            this._currentIndex++;
            this._skipOptionalSpaces();
          }
        }
        return this._currentIndex < this._endIndex;
      }

      Source.prototype.hasMoreData = function() {
        return this._currentIndex < this._endIndex;
      }

      Source.prototype.peekSegmentType = function() {
        var lookahead = this._string[this._currentIndex];
        return this._pathSegTypeFromChar(lookahead);
      }

      Source.prototype._pathSegTypeFromChar = function(lookahead) {
        switch (lookahead) {
          case "Z":
          case "z":
            return SVGPathSeg.PATHSEG_CLOSEPATH;
          case "M":
            return SVGPathSeg.PATHSEG_MOVETO_ABS;
          case "m":
            return SVGPathSeg.PATHSEG_MOVETO_REL;
          case "L":
            return SVGPathSeg.PATHSEG_LINETO_ABS;
          case "l":
            return SVGPathSeg.PATHSEG_LINETO_REL;
          case "C":
            return SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS;
          case "c":
            return SVGPathSeg.PATHSEG_CURVETO_CUBIC_REL;
          case "Q":
            return SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_ABS;
          case "q":
            return SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_REL;
          case "A":
            return SVGPathSeg.PATHSEG_ARC_ABS;
          case "a":
            return SVGPathSeg.PATHSEG_ARC_REL;
          case "H":
            return SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_ABS;
          case "h":
            return SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_REL;
          case "V":
            return SVGPathSeg.PATHSEG_LINETO_VERTICAL_ABS;
          case "v":
            return SVGPathSeg.PATHSEG_LINETO_VERTICAL_REL;
          case "S":
            return SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_ABS;
          case "s":
            return SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_REL;
          case "T":
            return SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS;
          case "t":
            return SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL;
          default:
            return SVGPathSeg.PATHSEG_UNKNOWN;
        }
      }

      Source.prototype._nextCommandHelper = function(lookahead, previousCommand) {
        // Check for remaining coordinates in the current command.
        if ((lookahead == "+" || lookahead == "-" || lookahead == "." || (lookahead >= "0" && lookahead <= "9")) && previousCommand != SVGPathSeg.PATHSEG_CLOSEPATH) {
          if (previousCommand == SVGPathSeg.PATHSEG_MOVETO_ABS)
            return SVGPathSeg.PATHSEG_LINETO_ABS;
          if (previousCommand == SVGPathSeg.PATHSEG_MOVETO_REL)
            return SVGPathSeg.PATHSEG_LINETO_REL;
          return previousCommand;
        }
        return SVGPathSeg.PATHSEG_UNKNOWN;
      }

      Source.prototype.initialCommandIsMoveTo = function() {
        // If the path is empty it is still valid, so return true.
        if (!this.hasMoreData())
          return true;
        var command = this.peekSegmentType();
        // Path must start with moveTo.
        return command == SVGPathSeg.PATHSEG_MOVETO_ABS || command == SVGPathSeg.PATHSEG_MOVETO_REL;
      }

      // Parse a number from an SVG path. This very closely follows genericParseNumber(...) from Source/core/svg/SVGParserUtilities.cpp.
      // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-PathDataBNF
      Source.prototype._parseNumber = function() {
        var exponent = 0;
        var integer = 0;
        var frac = 1;
        var decimal = 0;
        var sign = 1;
        var expsign = 1;

        var startIndex = this._currentIndex;

        this._skipOptionalSpaces();

        // Read the sign.
        if (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) == "+")
          this._currentIndex++;
        else if (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) == "-") {
          this._currentIndex++;
          sign = -1;
        }

        if (this._currentIndex == this._endIndex || ((this._string.charAt(this._currentIndex) < "0" || this._string.charAt(this._currentIndex) > "9") && this._string.charAt(this._currentIndex) != "."))
        // The first character of a number must be one of [0-9+-.].
          return undefined;

        // Read the integer part, build right-to-left.
        var startIntPartIndex = this._currentIndex;
        while (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) >= "0" && this._string.charAt(this._currentIndex) <= "9")
          this._currentIndex++; // Advance to first non-digit.

        if (this._currentIndex != startIntPartIndex) {
          var scanIntPartIndex = this._currentIndex - 1;
          var multiplier = 1;
          while (scanIntPartIndex >= startIntPartIndex) {
            integer += multiplier * (this._string.charAt(scanIntPartIndex--) - "0");
            multiplier *= 10;
          }
        }

        // Read the decimals.
        if (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) == ".") {
          this._currentIndex++;

          // There must be a least one digit following the .
          if (this._currentIndex >= this._endIndex || this._string.charAt(this._currentIndex) < "0" || this._string.charAt(this._currentIndex) > "9")
            return undefined;
          while (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) >= "0" && this._string.charAt(this._currentIndex) <= "9")
            decimal += (this._string.charAt(this._currentIndex++) - "0") * (frac *= 0.1);
        }

        // Read the exponent part.
        if (this._currentIndex != startIndex && this._currentIndex + 1 < this._endIndex && (this._string.charAt(this._currentIndex) == "e" || this._string.charAt(this._currentIndex) == "E") && (this._string.charAt(this._currentIndex + 1) != "x" && this._string.charAt(this._currentIndex + 1) != "m")) {
          this._currentIndex++;

          // Read the sign of the exponent.
          if (this._string.charAt(this._currentIndex) == "+") {
            this._currentIndex++;
          } else if (this._string.charAt(this._currentIndex) == "-") {
            this._currentIndex++;
            expsign = -1;
          }

          // There must be an exponent.
          if (this._currentIndex >= this._endIndex || this._string.charAt(this._currentIndex) < "0" || this._string.charAt(this._currentIndex) > "9")
            return undefined;

          while (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) >= "0" && this._string.charAt(this._currentIndex) <= "9") {
            exponent *= 10;
            exponent += (this._string.charAt(this._currentIndex) - "0");
            this._currentIndex++;
          }
        }

        var number = integer + decimal;
        number *= sign;

        if (exponent)
          number *= Math.pow(10, expsign * exponent);

        if (startIndex == this._currentIndex)
          return undefined;

        this._skipOptionalSpacesOrDelimiter();

        return number;
      }

      Source.prototype._parseArcFlag = function() {
        if (this._currentIndex >= this._endIndex)
          return undefined;
        var flag = false;
        var flagChar = this._string.charAt(this._currentIndex++);
        if (flagChar == "0")
          flag = false;
        else if (flagChar == "1")
          flag = true;
        else
          return undefined;

        this._skipOptionalSpacesOrDelimiter();
        return flag;
      }

      Source.prototype.parseSegment = function() {
        var lookahead = this._string[this._currentIndex];
        var command = this._pathSegTypeFromChar(lookahead);
        if (command == SVGPathSeg.PATHSEG_UNKNOWN) {
          // Possibly an implicit command. Not allowed if this is the first command.
          if (this._previousCommand == SVGPathSeg.PATHSEG_UNKNOWN)
            return null;
          command = this._nextCommandHelper(lookahead, this._previousCommand);
          if (command == SVGPathSeg.PATHSEG_UNKNOWN)
            return null;
        } else {
          this._currentIndex++;
        }

        this._previousCommand = command;

        switch (command) {
          case SVGPathSeg.PATHSEG_MOVETO_REL:
            return new SVGPathSegMovetoRel(owningPathSegList, this._parseNumber(), this._parseNumber());
          case SVGPathSeg.PATHSEG_MOVETO_ABS:
            return new SVGPathSegMovetoAbs(owningPathSegList, this._parseNumber(), this._parseNumber());
          case SVGPathSeg.PATHSEG_LINETO_REL:
            return new SVGPathSegLinetoRel(owningPathSegList, this._parseNumber(), this._parseNumber());
          case SVGPathSeg.PATHSEG_LINETO_ABS:
            return new SVGPathSegLinetoAbs(owningPathSegList, this._parseNumber(), this._parseNumber());
          case SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_REL:
            return new SVGPathSegLinetoHorizontalRel(owningPathSegList, this._parseNumber());
          case SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_ABS:
            return new SVGPathSegLinetoHorizontalAbs(owningPathSegList, this._parseNumber());
          case SVGPathSeg.PATHSEG_LINETO_VERTICAL_REL:
            return new SVGPathSegLinetoVerticalRel(owningPathSegList, this._parseNumber());
          case SVGPathSeg.PATHSEG_LINETO_VERTICAL_ABS:
            return new SVGPathSegLinetoVerticalAbs(owningPathSegList, this._parseNumber());
          case SVGPathSeg.PATHSEG_CLOSEPATH:
            this._skipOptionalSpaces();
            return new SVGPathSegClosePath(owningPathSegList);
          case SVGPathSeg.PATHSEG_CURVETO_CUBIC_REL:
            var points = {x1: this._parseNumber(), y1: this._parseNumber(), x2: this._parseNumber(), y2: this._parseNumber(), x: this._parseNumber(), y: this._parseNumber()};
            return new SVGPathSegCurvetoCubicRel(owningPathSegList, points.x, points.y, points.x1, points.y1, points.x2, points.y2);
          case SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS:
            var points = {x1: this._parseNumber(), y1: this._parseNumber(), x2: this._parseNumber(), y2: this._parseNumber(), x: this._parseNumber(), y: this._parseNumber()};
            return new SVGPathSegCurvetoCubicAbs(owningPathSegList, points.x, points.y, points.x1, points.y1, points.x2, points.y2);
          case SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_REL:
            var points = {x2: this._parseNumber(), y2: this._parseNumber(), x: this._parseNumber(), y: this._parseNumber()};
            return new SVGPathSegCurvetoCubicSmoothRel(owningPathSegList, points.x, points.y, points.x2, points.y2);
          case SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_ABS:
            var points = {x2: this._parseNumber(), y2: this._parseNumber(), x: this._parseNumber(), y: this._parseNumber()};
            return new SVGPathSegCurvetoCubicSmoothAbs(owningPathSegList, points.x, points.y, points.x2, points.y2);
          case SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_REL:
            var points = {x1: this._parseNumber(), y1: this._parseNumber(), x: this._parseNumber(), y: this._parseNumber()};
            return new SVGPathSegCurvetoQuadraticRel(owningPathSegList, points.x, points.y, points.x1, points.y1);
          case SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_ABS:
            var points = {x1: this._parseNumber(), y1: this._parseNumber(), x: this._parseNumber(), y: this._parseNumber()};
            return new SVGPathSegCurvetoQuadraticAbs(owningPathSegList, points.x, points.y, points.x1, points.y1);
          case SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL:
            return new SVGPathSegCurvetoQuadraticSmoothRel(owningPathSegList, this._parseNumber(), this._parseNumber());
          case SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS:
            return new SVGPathSegCurvetoQuadraticSmoothAbs(owningPathSegList, this._parseNumber(), this._parseNumber());
          case SVGPathSeg.PATHSEG_ARC_REL:
            var points = {x1: this._parseNumber(), y1: this._parseNumber(), arcAngle: this._parseNumber(), arcLarge: this._parseArcFlag(), arcSweep: this._parseArcFlag(), x: this._parseNumber(), y: this._parseNumber()};
            return new SVGPathSegArcRel(owningPathSegList, points.x, points.y, points.x1, points.y1, points.arcAngle, points.arcLarge, points.arcSweep);
          case SVGPathSeg.PATHSEG_ARC_ABS:
            var points = {x1: this._parseNumber(), y1: this._parseNumber(), arcAngle: this._parseNumber(), arcLarge: this._parseArcFlag(), arcSweep: this._parseArcFlag(), x: this._parseNumber(), y: this._parseNumber()};
            return new SVGPathSegArcAbs(owningPathSegList, points.x, points.y, points.x1, points.y1, points.arcAngle, points.arcLarge, points.arcSweep);
          default:
            throw "Unknown path seg type."
        }
      }

      var builder = new Builder();
      var source = new Source(string);

      if (!source.initialCommandIsMoveTo())
        return [];
      while (source.hasMoreData()) {
        var pathSeg = source.parseSegment();
        if (!pathSeg)
          return [];
        builder.appendSegment(pathSeg);
      }

      return builder.pathSegList;
    }
  }
}());
